Try the latest build of MCEBuddy. Hardware encoding depends a lot on the GPU capabilities. See this post for more information:
The GPU itself is also a factor for example the RTX 4080 is almost double the performance for RTX 4000 and my guess is that the RTX 2080 is slower.
If you open your conversion logs it’ll tell you the FPS for the conversion which can then be benchmarked against other cards (or drivers as drivers can have a significant impact on the performance also)